Political shock waves may hit on Saturday if Labour loses its traditionally safe seat of Mt Roskill. Vacated by Phil Goff when he took up the mayoral chains, it's widely tipped to continue to be a red electorate. But as we've just seen in the U.S anything can happen in politics. If Labour does lose, it's likely that there will be big ramifications for party leader Andrew Little. Political scientist, Bryce Edwards, goes over the possible scenarios.